Rotary screen



F. R. WILLSON.

ROTARY SCREEN. APPLICATloN` HLED 1AN.13,19|6. RENEwED JAN.v 3

Patented Mar. s, 1921.

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UNITED STATES PATENT OFFICE.

FREEMAN R. WILLSON, OF COLUMBUS, OHIO, ASSIGNOR T0 THE JEFFREY MANUFAC-TURING COMPANY, OF COLUMBUS, OHIO, A CORPORATION OF OHIO.

ROTARY SCREEN.

Application led January 13, 1916, Serial No. 71,888. Renewed January 31,1921. Serial No. 441,458.

T 0 all whom it may conce-rn:

Be it known that I, FREEMAN R. IVILLsoN, a citizen of the United States,residing at Columbus, in the county of Franklin and State of Ohio, haveinvented certain new and useful Improvements in Rotary Screens, of whichthe following is a specification, reference being had therein to theaccompanying drawing.

This invention relates to improvements in revolving screens, andparticularly to screens having the screen element' formed of parallelrods, wires or bars arranged in, or approximately in, planes transverseto the axis. Heretofore mechanisms of this class have been generallymade with a supporting frame and a screening element formed of fabricproduced by interweaving or interlacing wire of one degree of ineness oranother; this woven wire element either being carried as an integralsheet entirely around the axis and stretched upon its frame or being cutinto sections, and the sections severally secured to the frame upon arcsor chords of a. cylinder. The interweaving or interlacing of the strandwires and the mesh wires forms apertures, generally square, sometimessmaller, sometimes larger, and always surrounded by wires or rods. Manymaterials which are delivered to the screen are of such nature thatparticles or masses lodge in these apertures and clog them because oftheir adhering to, or being caught between, the cross wires or rods.

Again, when abrasive materials are being treated in the screens, thewire mesh sections rapidly wear away and renewed screen devices arerequired. If the rods orwires are interwoven or interlaced, relativelylarge sections must be taken out and others substituted.

My object is to provide a screen which will have no obstructions alonglines approximately parallel to the axis, and will permit an easy anduninterrupted flow or sliding along lines around the periphery and whichwill have the screen elements,

proper, formed in short rod or wire sections polygonal in cross'section,

which can be individually removed or inserted in the case of wear,breaking or bending. I at present prefer to embody I n improvements inscreen structures whic are but many of the features of novelty can alsobe utilized in making those which have the wires or rods Specificationof Letters Patent.

arranged in such way as to confOrm to the surface of a cylinder.

In the drawings,

Figure 1 illustrates a cylinder embodying my improvements, one end partbeing shown 1n s1de elevation, the other end part in vertical section,and the intermediate parts be- 1ng broken away;

Fig. 2 is a cross section on the line 2--2 of Fig. 1;

Fig. 3 is a side elevation of a portion of the screen showing the partson a larger scale;

Fig. 4 is a section along the line 4-4 of Fig: 3; i

ig. 5 Fig. 3;

Fig. 6 is a section on the 4line V6--6 of Fig. 3;

Fig. 7 is a perspective of a part of a saddle bar.

1 indicates a shaft upon which is supported the screen, indicated as an`entirety by 2. The shaft is mounted in bearings 3 and 4 and is providedwith a power receiving pulley 5. The bearing 4 is somewhat higher' thanthat at 3 and consequently the shaft and the screen are inclined fromthe receivis a section on the line 5-5 of ing end to the discharge endto cause thev materlal to gradually move downward toward the dischargeas it is carried around by the screen. 6 indicates a receiving cham berhaving a cylindrical or polygonal peripheral wall and an end closedsuiciently to retain the material initially fed to the screen throughthe chute or spout 7.

S, 8 are hubs secured to the shaft 1 and having socketed radiallyarranged projections. 9, 9 are radially arranged arms the inner ends ofwhich are respectively seated in the sockets, and the outer ends ofwhich are connected to the longitudinal bars 14 of the frame, each armhaving a nut 10 on the inside and a nut 11 on the outside of alongitudinal bar. Each bar 14 is angled or bent from a centrallongitudinal line to correspond with the angle of each section of thescreen to that of its neighbor. 12 and 13 are washers each with a facebeveled or angled to correspond with the angle of the bar 14. 15, 15indicate bands or frame sections, each arranged transversely to thescreen axis, each part of the band being at an angle to the next partcorresponding to the angle above referred to, so that the a ainst theouter surfaces of the longitudlnal bars 14. The radial frame arms `9pass through these band elements also, and are clamped in place by thewashers 12 and 13 and the nuts 10 and 11.

The parts above specified furnish a strong, .rigid and durable skeletonframe upon which thel parts are supported that constitute the screen,proper. f the transverse bands 15, there may be as many as the length ofthe screen demands.

16, 16 represent bars (which I shall refer to as saddle bars -orblocks), preferably cast in the way shown, that is to say, with onehalfangled as to the other half and having parallel recesses 17 formed alongeach of the outer faces. These bars or blocks can be fitted tightly to'the angle bars 14 each bar section 16 extending from one of thetransverse bands 15 to the other.

18, 18 are bars, rods or wires which constitute the screen elements,proper. They are formed or cut in sections of equal lengths. Each liesin a plane transverse to the axis and extends from the saddle block 16on one of the bars 14 to that on the next bar having each of its endsseated in one of the recesses 17. All of the adjacent ends of the barsof a row constituting a section of the screen are held in place by aclam bar 19, each of'which corresponds to a sa dle bar or block 16except that its recesses are formed in its under or inner surfaces.After the rods of a row have been put in place in the recesses theclamps 19 are locked securely in place by' bolts 20 which pass throughthe clampbars, the saddle blocks and the main angle bars. 14. If it isdesired to make the screens large in diameter without increasing thenumber of the longitudinal bars 14, that is, without increasing thenumber of peripheral sections, or if it be desired to employ relativelyfine, and therefore weaker, rods or wires 18; that is to sa if, from anycause, these elements 18 are ound to be too long for. the load ofmaterial placed upon them, and they tend to sag or bend or be thrown outof parallelism, intermediate bracing devices can be used. 21 indicates asupplemental saddle bar preferably cast and having rod-holding seatsbetween transverse ribs 22 corresponding in number and size to the rodsor wires 18. Each is formed with lugs or projections 23 at suitableintervals, longitudinall 24 is a longitudinally arranged bar whic mayextend from end to end of the screen. It is preferably square in crosssection and is arranged to lie in the seats furnished by the lugs 23 andhold the saddle bars 21 in place. It occupies lines outside of thetransverse bands 15, and is clam ed to each of them by a recessed blockan washer at 26 and a bolt 25.

ventire section of the sur It will be seen that the interior surface ofthe screen proper is practically unobstructed as concerns lines inplanes transverse to the axis, the only interruptions being the thinframe bars 14, the screen rods or wires 18 extending practically acrossan ace without obstruction. When the supplemental brace devices areused, shown at 21 and 24, thereare no projections extending to theinterior of the screen surface, the longitudinal surfaces of thescreen/rods being exposed on the interior virtually throughout theirentire length. Consequently there is no clogging or stoppage of thematerial in the passagesor apertures through the screen.

As hereinbefore noted, when materials are screened which are highlyabrasive, the metal parts forming the screen surface are rapidly wornaway. When that occurs with the mechanism here shown, it is merelynecessary to loosen the clamping devices and remove the rod or rodswhich are worn and substitute new ones. This avoids the labor involvedin dismantling and rebuilding the structure, and obviates the loss of anextensive part of it in case repair is necessary.

It will be seen that the operative surface of the screen (I therebymeaning the entire number of the screen rodsand their outermost holdingdevices), is composed of a series of rows of detachable rods, the termrow referring to those which lie in substantially a common planeparallel to the axis of the screen, although each lies in a plane thatis transverse to the screens axis, there being, in the constructionshown, eight of these rows in a series extending continuously around theaxis. The rods may also be regarded as being arranged in a row of setswith ei ht in each set, all lying in nsubstantially t e same planetransverse to the axis. Again, it will be noticed that each of the rowsis composed of sections, there being a large number of screen rods ineach section, and each section extending from one of the brace bands orrings 15 to the next. What I claim is:

1. In a rotary screen, the combination with a rigid frame comprising anaxial shaft, a plurality of sets of radial members on the shaft and aseries of bars extendin lon tudinally of the screen ,and secure to t eouter ends of the radial members, said bars being thin and having theirwidth extending circumferentially of the screen, of screen rods disposedin planes transverse to the screen axis and arran ed in a plurality ofseries extending longitudinally of the screen with the abutting rodendsof each series resting on the outer sides of the said longitudinalframe bars, means on the outer sides of said screen bars for detachablysecuring the ends of the screen rods thereto, and means for bracing thescreen rods intermediate their ends comprising bars extendinglongitudinally of the screen on the outer sides of the screen rods.

2. In a rotary screen, the combination with a rigid frame comprising anaxial shaft, a

plurality of sets of radial members on the shaft and a series of barsextending longi` bers, and longitudinally extending clamping bars forrigidly connecting the ends of the screen bars and the spacing means.

3. In a rotary screen, the combination With a rigid frame comprising anaxial shaft, a plurality of sets of radial members on the shaft and aseries of bars extendin longitudinally of the screen and secure to theouter ends of the, radial members, said bars being thin and having theirwidth extending circumferentially of the screen and formed with recessesfor the reception of screen rods, of screen rods disposed in planestransverse to the screen axis and arranged in a plurality of seriesextending longitudinally of the screen with the abutting rod ends ofeach series resting in said recesses on the outer sides of the saidlongitudinal frame bars, and means on the outer sides of said screenbars for detachably securing the ends of the screen rods thereto.

4. In a rotary screen, the combination of a frame comprising radialvmembers adapted to be mounted on a rotary shaft, longitudi nal memberscarried by said radial members and having on their outer sides twoseries of recesses, each recess extending in a peri heral direction andthe recesses at one si e of the bar being arranged at an angle to therecesses at the other side of said bar, screening rods seated in saidrecesses and extending in a direction peripherally of the screen, andmeans for securing said rods in said recesses, said longitudinal membershaving in line. with their recesses abutting means for said rods.

5. In a rotary screen, the combination of a frame comprising radialmembers adapted to be mounted on a rotary sha-ft, longitudinal memberscarried by said radial members and having on their outer sides recessesextending in a peripheral direction, screening rods seated in saidrecesses and extending in a direction peripherally of the screen, meansfor securing said rods in said recesses, and transverse bands arrangedat intervals `between. the screen rods and extending around the screenand attached to the outer sides of said longitudinal bars.

In testimony whereof, I affix my signature, in presence of twoWitnesses.

FREEMAN R. WILLSON. IVitnesses:

HARRY C. DEAN, DUDLEY T. FISHER.

